Anyone know about this PIC?

[Acetronics2]

Hi, Karen

just some lines to see ... ( it's for a 18F452 ! )

'*****************************************************************************
'*****************************************************************************
'Config processeur
'*****************************************************************************
'

'@  __CONFIG    _CONFIG1L, _WDT_OFF_1L & _WDTPS_128_1L
@   __CONFIG    _CONFIG1H, _OSCS_OFF_1H & _XT_OSC_1H
@	__CONFIG	_CONFIG2L, _BOR_OFF_2L & _BORV_27_2L & _PWRT_ON_2L
@   __CONFIG    _CONFIG2H, _WDT_OFF_2H & _WDTPS_128_2H
'@  __CONFIG    _CONFIG3L, _WDT_OFF_3L & _WDTPS_128_3L
@   __CONFIG    _CONFIG3H, _CCP2MX_OFF_3H
@   __CONFIG    _CONFIG4L, _STVR_OFF_4L & _LVP_OFF_4L & _DEBUG_OFF_4L
'@  __CONFIG    _CONFIG4H, _WDT_ON_4H & _WDTPS_128_4H
@   __CONFIG    _CONFIG5L, _CP0_OFF_5L & _CP1_OFF_5L & _CP2_OFF_5L & _CP3_OFF_5L
@   __CONFIG    _CONFIG5H, _CPB_OFF_5H & _CPD_OFF_5H
@   __CONFIG    _CONFIG6L, _WRT0_OFF_6L & _WRT1_OFF_6L & _WRT2_OFF_6L & _WRT3_OFF_6L
@   __CONFIG    _CONFIG6H, _WRTC_OFF_6H & _WRTB_OFF_6H & _WRTD_OFF_6H 
@   __CONFIG    _CONFIG7L, _EBTR0_OFF_7L & _EBTR1_OFF_7L & _EBTR2_OFF_7L & _EBTR3_OFF_7L
@   __CONFIG    _CONFIG7H, _EBTRB_OFF_7H 

'*****************************************************************************
'Config TIMERs

T0CON = %00000010	' 16Bits 1/8 prescaler, Horloge Système, OFF

T1CON = %00001010	'1/1 prescaler, Quartz 32,768

T3CON = %01110001	' ccp SUR TMR3,1/8 prescaler,Horloge système,ON

'*****************************************************************************
'Config CCP1 arret CCP2

CCP1CON = %00000101	' Capture sur front montant 

CCP2CON = %00000000	'inhibition module CCP2

'*****************************************************************************
'Inhibition SSP

SSPCON1.5 = 0

'*****************************************************************************
'Config Interruptions

INTCON  = %10000000
INTCON2 = %11110000
INTCON3 = %00000000

PIE1    = %00000100
PIE2    = %00000000

IPR1    = %00000001
IPR2	= %00000000

RCON	= %10000000

'*****************************************************************************
'Config ADC
'*****************************************************************************

ADCON0 = %11000000
ADCON1 = %10000011

'*****************************************************************************
'*****************************************************************************
'Config et Prepositionnement E/S
'*****************************************************************************

PORTA	= %00000000
PORTB 	= %00000100
PORTC	= 0
PORTD	= 0
PORTE	= 0

TRISA 	= %00111111
TRISB	= %11100110
TRISC	= %00000111
TRISD	= %00000000
TRISE	= %00000000
'

It's for a gadget that measures Hours of work ( total and split ), batt voltage, RPM, water and oil temp, and oil pressure.
Also logs the maxima, alerts if thresolds reached, and shows programmed maintenance needed ...

...

Alain

[karenhornby]

Your a star Thats almost exactly what I was after as i wont be using anything on the pic other than straight digital inputs and outputs, not using any of the "fancy function"
Its basically going to be 3 inputs that go high a number of outputs that go high or low depending on the inputs, an lcd display connected to it, and a DS18B20 temp sensor.
Oh quick question I'm pretty sure the answer is yes but can you directly substitute a DS18B20 - PAR (parasitic takes it's power from DQ pin) the with a 18B20 just by leaving the other pin unconnected?

[SteveB]

... can you directly substitute a DS18B20 - PAR (parasitic takes it's power from DQ pin) the with a 18B20 just by leaving the other pin unconnected?

Not quite clear on which one you plan to substitude for which, so here is the answer either way:

Yes, you can use a DS18B20 to replace a DS18B20-PAR without problems, just connect Pin 3 (Vdd) to your power supply.

No, you can not use a DS18B20-PAR to replace a DS18B20 unless you modify the circuit. The reason is that the PAR version requires a "strong pullup" during temp conversion. Page 3 "Parasite Power", and figure 2, of the DS18B20-PAR data sheet has the details. If the number of PAR units is small, you can (I have) eliminate the MOSFET they suggest and just hook it directly to a pin to drive it, as the total current is well below the 25ma limit of a single PIC pin.

HTH,
SteveB